last night in massachusetts, senator brown and elizabeth warren. they both said something goofy. viseen that or heard that a billion times. that's regrettably, the unfortunate part. but the viewers get tow watch the whole thing. >> i think if the viewer tunes in, it is a chance to see both people side by side. the great danger for an incumbent president is, if the challenger comes off as being competent in that setting, all of a sudden, the challenger's elevated to being equal of the incumbent. i think incumbent presidents have more at risk than do the challengers. >> greta: is it smart to engage your opponent, or do you just deal with the moderator? do you turn to the opponent and say, look, challenge that one? >> i think you are better off to talk straight to the american people. not even talking to the moderator, talking to the american people. one of the most famous lines, back to your point, about clever lines was ronald reagan saying, i am not going to let my opponent's youth and inexperience count against him. everybody broke up laughing because he had taken the issue of h